Device For Illustrating the Transposition of Musical Scales Page: 4 of 6
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Device For Illustrating the Transposition of Musical Scales, patent, July 28, 1885; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth171042/m1/4/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.